Pavement engineering considers three main technical justifications for paving an unsurfaced road: (i) to provide a surface that keeps water out of the moisture-susceptible underlying natural subgrade soils, (ii) to cushion lower lying weaker layers from the damaging effects of traffic loads, and (iii) to provide a smooth, safe, dust-free, all-weather, fast, and reliable surface for vehicular and non-motorized traffic. Since funding is always constrained...
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